scholarly journals Artificial perfect electric conductor-perfect magnetic conductor anisotropic metasurface for generating orbital angular momentum of microwave with nearly perfect conversion efficiency

2016 ◽  
Vol 119 (6) ◽  
pp. 064506 ◽  
Author(s):  
Menglin L. N. Chen ◽  
Li Jun Jiang ◽  
Wei E. I. Sha
Keyword(s):  
Angular Momentum ◽  
Conversion Efficiency ◽  
Orbital Angular Momentum ◽  
Perfect Electric Conductor ◽  
Magnetic Conductor ◽  
Electric Conductor ◽  
Perfect Magnetic Conductor

scholarly journals SAR Reduction Using Integration of PIFA and AMC Structure for Pentaband Mobile Terminals

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Jae-Gon Lee ◽  
Jeong-Hae Lee
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Dielectric Film ◽  
Perfect Electric Conductor ◽  
Mobile Terminals ◽  
Magnetic Conductor ◽  
Spreading Effect ◽  
Electric Conductor ◽  
Em Field ◽  
High Band

In this paper, a capacitive grating artificial magnetic conductor (AMC) is presented to reduce the specific absorption rate (SAR) in pentaband mobile terminals. The AMC structure is implemented using a dielectric film with the printed arrays of the metal strips placed at the top and the bottom of the dielectric. It is difficult to design the AMC structure to operate at low (824~960 MHz) and high bands (1710~2170 MHz) simultaneously, because of the limited space available for the antenna. Hence, we have designed the capacitive grating AMC to operate at a high band. Then, we attached a PIFA to the AMC structure to cover low and high bands. As the AMC structure is operated as a perfect electric conductor (PEC) in low band, the radiating branches of the PIFA for the low and high bands should be located on the non-AMC and the AMC structures, respectively. Even though the AMC structure is operated at a high band, the effect against the head could be reduced in the pentaband due to the spreading effect of the electromagnetic (EM) field at lower bands. From measured results, the 1 g SAR in the case of the AMC antenna is significantly lower than that in the case where only the PIFA is present in the pentaband.

scholarly journals A Triple-Band Antenna Loaded with Reflector Surface for WLAN and 5G Applications

2020 ◽  
pp. 729-734
Author(s):  
Tengfei Hu ◽  
◽  
Zhenni Pan ◽  
Megumi Saitou ◽  
Jiang Liu ◽  
...  
Keyword(s):  
Base Stations ◽  
Antenna Design ◽  
Perfect Electric Conductor ◽  
Magnetic Conductor ◽  
Electric Conductor ◽  
Lower Band ◽  
Low Profile ◽  
Reflector Surface ◽  
Profile Characteristics ◽  
Triple Band

In this paper, a novel triple-band antenna with reflector surface which has the property of both artificial magnetic conductor (AMC) surface and perfect electric conductor (PEC) for WLAN and Sub-6G 5G applications is proposed. The presented antenna is composed of two parts: the AMC surface and the microstrip-fed printed dipole. Baluns are used to excite the dipoles. This antenna design combines the advantages of AMC and PEC. In lower band and middle band, the inserted board works as AMC surface. This AMC surface can help the antenna to achieve unidirectional radiation pattern and low-profile characteristics. While at upper band the antenna works as PEC surface. PEC surface increases the gain of the antenna in upper band. As a result, the proposed antenna can offer an impedance band from 2.39 GHz to 2.63 GHz and from 3.61 GHz to 3.72 GHz and from 5.61 GHz to 5.84 GHz when the S11 is less than - 10dB. Stable radiation patterns with peak gain of 5.6 dBi, 6.5 dBi and 9.6 dBi are obtained in lower band, middle band and upper band, respectively. The proposed antenna can be used for multiband base stations for WLAN and 5G applications.

scholarly journals Modified Theory of Physical Optics Approach to Diffraction by an Interface between PEMC and Absorbing Half-Planes

2021 ◽  
Vol 10 (2) ◽  
pp. 78-84
Author(s):  
Y. Z. Umul
Keyword(s):  
Plane Waves ◽  
Wave Number ◽  
Physical Optics ◽  
Magnetic Conductor ◽  
Electric Conductor ◽  
Perfect Magnetic Conductor ◽  
Scattered Fields ◽  
Electromagnetic Plane Waves ◽  
Modified Theory ◽  
Electromagnetic Plane

The scattering of electromagnetic plane waves by an interface, located between perfect electromagnetic conductor and absorbing half-planes is investigated. The perfect electromagnetic conductor half-plane is divided into perfect electric conductor and perfect magnetic conductor half-screens. The same decomposition is done for the absorbing surface. Then four separate geometries are defined according to this approach. The scattered fields by the four sub-problems are obtained with the aid of the modified theory of physical optics. The resultant scattering integrals are combined in a single expression by using key formulas, defined for the perfect electromagnetic conductor and absorbing surfaces. The scattering integral is asymptotically evaluated for large values of the wave-number and the diffracted and geometric optics fields are obtained. The behaviors of the derived field expressions are analyzed numerically.

Advanced Mode Unity Using Loop Antennas Proximate to Reflector for Orbital Angular Momentum Communication

2018 ◽  
Author(s):  
Ryohei Yamagishi ◽  
Hiroto Otsuka ◽  
Ryo Ishikawa ◽  
Akira Saitou ◽  
Hiroshi Suzuki ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Loop Antennas
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